Teleport and boost skill balance update

This update adjusts two skills so close-range engagements have clearer counterplay and movement windows feel more meaningful.

What changed:

• Teleport now checks the landing distance after the tank arrives.
• If the landing position is within 4 tiles of the opposing tank, the teleported tank must wait 2 frames before firing.
• If the landing position is more than 4 tiles away, the teleported tank can still fire immediately.
• Boost duration increased from 4 frames to 6 frames.

The intent is to keep long-range repositioning responsive while making point-blank teleport attacks less instant.